Uses v1 testing package in various reconcilers (#6960)
Uses v1 testing package in various reconcilers (#6960)

* hpa reconciler uses v1 testing package

* certificate reconciler uses v1 testing package

* ingress reconciler uses v1 testing package

* nscert reconciler uses v1 testing package

knative-sandbox/net-certmanager,knative-sandbox/net-certmanager